تاریخ و زمان

API تاریخ جاوا (java.time)

از Java 8 به بعد، API مدرن java.time استاندارد است:

import java.time.LocalDate;
import java.time.LocalTime;
import java.time.LocalDateTime;

LocalDate — تاریخ

LocalDate today = LocalDate.now();
System.out.println(today);              ← 2026-08-16

LocalDate birthday = LocalDate.of(2000, 6, 15);
System.out.println(birthday.getYear());   ← 2000
System.out.println(birthday.getMonth());  ← JUNE
System.out.println(birthday.getDayOfWeek()); ← THURSDAY

LocalTime — زمان

LocalTime now = LocalTime.now();
System.out.println(now.getHour());
System.out.println(now.getMinute());

محاسبات تاریخ

LocalDate today = LocalDate.now();

LocalDate tomorrow = today.plusDays(1);
LocalDate nextMonth = today.plusMonths(1);
LocalDate lastYear = today.minusYears(1);

// اختلاف بین دو تاریخ
LocalDate start = LocalDate.of(2026, 1, 1);
long days = java.time.temporal.ChronoUnit.DAYS.between(start, today);

قالب‌بندی

import java.time.format.DateTimeFormatter;

LocalDate date = LocalDate.now();
DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy/MM/dd");
System.out.println(date.format(fmt));   ← 2026/08/16

محاسبه سن

LocalDate birth = LocalDate.of(2000, 6, 15);
int age = Period.between(birth, LocalDate.now()).getYears();
System.out.println(age);